if (!Function.prototype.bind) {
  Function.prototype.bind = function(oThis) {
    if (typeof this !== 'function') {
      // closest thing possible to the ECMAScript 5
      // internal IsCallable function
      throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
    }

    var aArgs   = Array.prototype.slice.call(arguments, 1),
      fToBind = this,
      fNOP    = function() {},
      fBound  = function() {
        return fToBind.apply(this instanceof fNOP && oThis
            ? this
            : oThis,
          aArgs.concat(Array.prototype.slice.call(arguments)));
      };

    // test this.prototype in case of native functions binding:
    if (this.prototype)
      fNOP.prototype = this.prototype;
    fBound.prototype = new fNOP();

    return fBound;
  };
}